问题：
[单选题]以下程序的运行结果是_____。 sub(int x,int y,int z) {z=y-x;} main() {int a,b,c; sub(10,5,&a); sub(7,a,&b); sub(a,b,&c); printf("%4d,%4d,%4d\n",a,b,c);}
A、5,2,3
B、-5,-12,-7
C、-5,-12,-17
D、5,-2,-7
参考答案：
B
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